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Spring Equinox – Vernal Equinox

The Vernal (Spring) Equinox in the Northern Hemisphere is the Autumnal (Fall) Equinox in the Southern Hemisphere and vice versa.

Equinox and solstice illustration.

Equinoxes and solstices happen twice a year.

Equinoxes and Solstices are opposite on either side of the equator. (Ill. not to scale)

Not Entirely Equal Day & Night

On the equinoxes the Sun shines directly on the equator and the length of day and night is nearly equal – but not quite.

The March equinox marks the moment the Sun crosses the celestial equator – the imaginary line in the sky above the Earth’s equator – from south to north and vice versa in September.

When is the Equinox in my City?

Northern Hemisphere Vernal Equinox

(USA, Central America, Canada, Europe, Asia, northern Africa)

Southern Hemisphere Vernal Equinox

(Australia, New Zealand, South America, southern Africa)

First Day of Spring?

In the Northern Hemisphere, the Vernal (Spring) Equinox marks the first day of astronomical spring. There's also another, more common definition of when the seasons start, namely meteorological definitions, which are based on average temperatures rather that astronomical events.

Topics: Astronomy, Seasons, March, September, Sun, Earth, Calendar, Equinox

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Equinox and solstice illustration.

When is Fall Equinox?

The fall (autumnal) equinox in the Northern Hemisphere is in September. In the Southern Hemisphere, it's in March. more

September equinox illustration

September Equinox

The Sun shines directly at the Equator on the September equinox and the length of day and night is nearly equal, but not quite. more